Ahormone travels through the circulatory system to deliver a signal. of what is this an example?

a. enzyme
b. intracellular
c. ion channel
d. intercellular

Function. Cilia and flagella move liquid past the surface of the cell. For single cells, such as sperm, this enables them to swim. For cells anchored in a tissue, like the epithelial cells lining our air passages, this moves liquid over the surface of the cell (e.g., driving particle-laden mucus toward the throat).

i hope this helped